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[PATCH] Convert kernel/cpu.c to mutexes 

Convert kernel/cpu.c from semaphore to mutex.

I've reviewed all lock_cpu_hotplug() critical sections, and they all seem to
fit mutex semantics.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-06-26 00:24:32 -07:00 committed by Linus Torvalds
parent 1fb00c6cbd
commit 81615b624a
1 changed files with 5 additions and 5 deletions
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10
kernel/cpu.c
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@ -13,10 +13,10 @@
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/stop_machine.h>
#include <asm/semaphore.h>
#include <linux/mutex.h>
/* This protects CPUs going up and down... */
static DECLARE_MUTEX(cpucontrol);
static DEFINE_MUTEX(cpucontrol);
static BLOCKING_NOTIFIER_HEAD(cpu_chain);
@ -30,9 +30,9 @@ static int __lock_cpu_hotplug(int interruptible)
if (lock_cpu_hotplug_owner != current) {
if (interruptible)
ret = down_interruptible(&cpucontrol);
ret = mutex_lock_interruptible(&cpucontrol);
else
down(&cpucontrol);
mutex_lock(&cpucontrol);
}
/*
@ -56,7 +56,7 @@ void unlock_cpu_hotplug(void)
{
if (--lock_cpu_hotplug_depth == 0) {
lock_cpu_hotplug_owner = NULL;
up(&cpucontrol);
mutex_unlock(&cpucontrol);
}
}
EXPORT_SYMBOL_GPL(unlock_cpu_hotplug);